An unusual Shoushan soapstone rectangular seal, Qing Dynasty, 17th-18th century, the caramel-coloured skin streaked with darker inclusions, one side with a two line incised inscription 'Nan Er Yu Shang Ling Yang Ge, Di Yi gong Ming Bu Ai Qian', signed: 'San Qiao Fang Gu', the seal face carved with six characters 'Wei Ren Xian Wo Zhen, 9.9 cm high, 4.1 cm wide. Reference: Christies NY, 'A Connoisseur's Vishion, property from the Xu Hangqing Collection' 15/9/2011, lot 921, for a Shoushan seal of the same shape but green in colour